1. Agenda Item 2. A review of basic concepts and terminology related to phosphorus movement from cropland to streams and rivers. Great Lakes Protections Fund Grant 833 – Development of a Phosphorus Soil Test Metric to Reduce Dissolved Reactive Phosphorus Loading to Lake Erie. Team Meeting # 5 July 23-24, 2013

2. Some Agronomic Terms Soil System Terms Particulate Phosphorus Losses Dissolved Reactive Phosphorus Losses Some basic concepts and related terms that will likely be used See handout – Some basic concepts and terminology …

3. Some Agronomic Terms Critical STP for corn and soybeans Critical STP for wheat and alfalfa No additional P fertilizer recommended What is the agronomic range for soil test values?

4. Tillage Terminology NT= No-Till, MT = Mulch Till (>30%), RT = Reduced Till (15-30%) ST = Strip Till (>30%), CT= Conventional Till (plow or <15%) CTIC Till Type Symbol to Use: Fall Tillage Symbols to use: N = None, FM = Mulch >30%, FR = Reduced (Chisel/Disk<30%), FS = Fall Strip Till, FP = Fall Plow Other terms Mold board plowing (inversion tillage) Vertical tillage Incorporation

6. Soil Profile Sandusky Watershed Stratified Soil Testing Program

7. Dissolving and runoff of broadcast fertilizer granules before incorporation. Tile drainage MacroporesMacropores Revised diagram for pathways of dissolved phosphorus runoff.

8. A comparison of maintenance phosphorus fertilizer application rates and watershed export rates of total phosphorus and dissolved reactive phosphorus. Sediment Delivery Ratio --- lbs/acre loss at watershed divided by lbs/acre at edge of field Enrichment Ratio --- mg P/kg SS at edge of field divided by mg P/kg soil in the cropland soil.